package com.atguigu.gulimail.product.service.impl;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimail.product.dao.CategoryDao;
import com.atguigu.gulimail.product.entity.CategoryEntity;
import com.atguigu.gulimail.product.service.CategoryService;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {


    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {
        List<CategoryEntity> categoryEntities = baseMapper.selectList(null);

        //找到所有的一级分类
        List<CategoryEntity> collect = categoryEntities.stream().filter(x -> x.getParentCid() == 0)
                .map(menu->{
                    menu.setChildren(getChildrens(menu,categoryEntities));
                    return menu;
                }).sorted((menu1, menu2) -> {
                    return (menu1.getSort() == null?0:menu1.getSort()) - (menu2.getSort() == null?0:menu2.getSort());
                }).collect(Collectors.toList());

        return collect;
    }

    @Override
    public void removeMenuByIds(Collection collection) {
        baseMapper.deleteBatchIds(collection);
    }

    /**
     * 递归查找所有菜单的子菜单
     *
     * @param root
     * @param all
     * @return
     */
    private List<CategoryEntity> getChildrens(CategoryEntity root, List<CategoryEntity> all) {
        List<CategoryEntity> children = all.stream().filter(categoryEntity -> {
            return categoryEntity.getParentCid().equals(root.getCatId());
        }).map(categoryEntity -> {
            categoryEntity.setChildren(getChildrens(categoryEntity, all));
            return categoryEntity;
        }).sorted((menu1, menu2) -> (menu1.getSort() == null?0:menu1.getSort()) - (menu2.getSort() == null?0:menu2.getSort())
        ).collect(Collectors.toList());
        return children;
    }

}